290 Mr George Traill on the 



103. Ceramium rubrum (Huds. ), Ag. 



On rocks, and epiphytic on Algae, in pools between tide marks. 

 All the year. Fruit in summer. The variety proliferum also 

 occurs in pools, and in shaded niches at the "Vault." Host plants 

 numerous : I have given thirty-three in my paper on the " Parasitical 

 Algse of the Firth of Forth," and others could be mentioned. 



Family.— CRYPTONEMIACE^. 

 SARCOPHYLLIS, Kiitz. 



104. Sarcophyllis edulis (Stackh.), J. Ag. {Iridcea eclulis, Bory.) 

 Common on rocks in exposed places, in the shade, near low-water 



mark. Perennial. Fruit in autumn and winter. 



FASTIGIARIA, Stackh. 



105. Fastigiaria furcellata (Linn.), Stackh. [Furccllaria fastigiata 



(Huds.), Lainour. ) 



On rocks, chiefly in sandy pools near low-water mark. Perennial. 

 Fruit in winter. 



DUMONTIA, Lamour. 



106. Dumontia filiformis (Fl. Dan.), Grev. 



In rock pools at about half-tide level. All the year. In best 

 condition from March to October ; plants being comparatively rare, 

 and stunted, during winter. Fruit in summer. The variety crispata 

 also occurs, chiefly where there are streams of either salt or fresh 

 water. 



Family.— GIGARTINACE.E. 



CHONDRUS, Stackh. 



107. Chondrus crispus (Linn.), Lyngb. 



Common on rocks between tide marks. Always submerged. 

 Perennial. Fruit in winter and spring. 



GIGARTINA, Stackh. 



108. Gigartina mamillosa (Good, and Woodw.), J. Ag. 



Common on exposed rocks, and in pools, from about haK-tide level 

 to low- water mark. Perennial. Frait in winter. 



CALLOPHYLLIS, Kiitz. 



109. Gallophyllis laciniata (Huds.), Kiitz. {Rhodymenia laciniata, 



Grev.) 



Epiphytic on Laminaria liyperhorea. Cast ashore in fine speci- 

 mens. Biennial. Capsules in spring ; granules in summer. 



AHNFELDTIA, Fr. 



110. Ahnfeldtia plicata, Fr. {Gymnogongrus 'plicatus, 'Kniz.) 

 Common, and sometimes of large size, in sandy pools near low- 

 water mark. Always submerged. Perennial. Fruit early in 

 AV'inter. 



